We're not used to the pacing yet. Rutgers Business School professor Terri Kurtzberg says that while in audible conversations “it’s clear how long a silence should last before you need to respond. There’s no norm with digital communication."

We want to say no to a favor asked, but feel guilty. “I want to say ‘no,’ but feel that the right thing is to say ‘yes,’ so I am frozen and then I plan on going back to the e-mail to draft a reply, but it gets buried. Then I feel even worse for not replying and put it off again. It’s not nice to leave people hanging, but I do.”

It's easier. “If people send me a message that I don’t want to deal with, it’s easier not to respond. At this stage, there are so many requests from my children, I can’t deal with requests from adults.”

Not replying sends a message. “Recently, a nanny asked me for a job reference. I don’t think the nanny deserves the reference. I thought about responding, but didn’t. To me, it’s easier not to say something.”

“No response is the new no.”

We mean to write a thoughtful response, but never find the time. “Sometimes, I don’t answer because I don’t have time to give the response I think is deserved, so I put it off until later, then forget and the message winds up being that I didn’t care enough to respond, when, in fact, I cared too much."

Replying will just result in more email. “Replying to e-mail is like slaying the Hydra. Once you answer one, it often generates a flurry of more e-mails.”

On Twitter, WSJ publisher Raju Narisetti linked to this article, and said, "ignoring E-Mails is a new way to say 'No,' increasing irritation levels."